Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 2 - Review Exercises - Page 430: 37

Answer

a. falls to the left and also falls to the right. b. neither c. See graph.
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Work Step by Step

a. The leading term of the function $f(x)=-x^4+6x^3-9x^2$ is $-x^4$, with a coefficient of $-1$ and an even power. Thus, we can identify its end behaviors as $x\to-\infty, y\to-\infty$ and $x\to\infty, y\to-\infty$. That is, the curve falls to the left and also falls to the right. b. We test $f(-x)=-(-x)^4+6(-x)^3-9(-x)^2=-x^4-6x^3-9x^2$ as $f(-x)\ne f(x)$ and $f(-x)\ne -f(x)$, the function is neither symmetric with respect to the y-axis nor with the origin. c. See graph.
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